linux-kernel - Re: [PATCH] media: docs-rst: Clarify duration of LP-11 mode

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Message-ID: <2a84063e-b66f-bef2-1277-3514566aa236@gmail.com>
Date:   Mon, 12 Aug 2019 14:39:45 -0700
From:   Steve Longerbeam <slongerbeam@...il.com>
To:     Ian Arkver <ian.arkver.dev@...il.com>, linux-media@...r.kernel.org
Cc:     Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] media: docs-rst: Clarify duration of LP-11 mode

Hi Ian,

On 8/12/19 1:53 AM, Ian Arkver wrote:
> Hi Steve,
>
> On 11/08/2019 18:36, Steve Longerbeam wrote:
>> Add a sentence that makes it more clear when the CSI-2 transmitter
>> must, if possible, exit LP-11 mode. That is, maintain LP-11 mode
>> until stream on, at which point the transmitter activates the clock
>> lane and transition to HS mode.
>>
>> Signed-off-by: Steve Longerbeam <slongerbeam@...il.com>
>> ---
>>   Documentation/media/kapi/csi2.rst | 10 +++++++---
>>   1 file changed, 7 insertions(+), 3 deletions(-)
>>
>> diff --git a/Documentation/media/kapi/csi2.rst 
>> b/Documentation/media/kapi/csi2.rst
>> index a7e75e2eba85..6cd1d4b0df17 100644
>> --- a/Documentation/media/kapi/csi2.rst
>> +++ b/Documentation/media/kapi/csi2.rst
>> @@ -49,9 +49,13 @@ where
>>     The transmitter drivers must, if possible, configure the CSI-2
>>   transmitter to *LP-11 mode* whenever the transmitter is powered on but
>> -not active. Some transmitters do this automatically but some have to
>> -be explicitly programmed to do so, and some are unable to do so
>> -altogether due to hardware constraints.
>> +not active, and maintain *LP-11 mode* until stream on. Only until
>
> s/until/at/ perhaps?

Sure, that's a bit better language.

Steve

>
> Regards,
> Ian
>> +stream on should the transmitter activate the clock on the clock lane
>> +and transition to *HS mode*.
>> +
>> +Some transmitters do this automatically but some have to be explicitly
>> +programmed to do so, and some are unable to do so altogether due to
>> +hardware constraints.
>>     Stopping the transmitter
>>   ^^^^^^^^^^^^^^^^^^^^^^^^
>>